13213809 has 12 divisors (see below), whose sum is σ = 21813376. Its totient is φ = 7550712.

The previous prime is 13213769. The next prime is 13213829. The reversal of 13213809 is 90831231.

It is not a de Polignac number, because 13213809 - 2⁹ = 13213297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13213829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104809 + ... + 104934.

Almost surely, 2^13213809 is an apocalyptic number.

It is an amenable number.

13213809 is a deficient number, since it is larger than the sum of its proper divisors (8599567).

13213809 is a wasteful number, since it uses less digits than its factorization.

13213809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209756 (or 209753 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 13213809 is about 3635.0803292362. The cubic root of 13213809 is about 236.4155336061.

The spelling of 13213809 in words is "thirteen million, two hundred thirteen thousand, eight hundred nine".